A researcher is interested in whether union workers earned significantly higher wages than nonunion workers last year. She interviewed 10 union workers and 20 nonunion workers, and their wages are shown below: sample size sample mean sample SD union 10 20.5 2.0 nonunion 20 15.5 4.0 (Unit used: CAD) Test the null hypothesis of no difference between the wages of union workers and non-union workers. Let X = wages earned of union workers, and Y = wages earned of nonunion workers. Let ux = the population mean wage earned of union workers, and µy = the population mean wage earned of non-union workers. Let X-Bar = the sample mean wage earned of union workers, and Y-Bar = the sample mean wage earned of non-union workers. The observed t value is about O 5.37 O 6.91 O 7.23 O 4.56 O 8.91

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Percentage

A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.

Algebraic Expressions

In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.

Numbers

Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.

Subtraction

Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.

Addition

Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.